[imp] build improvements

This moves files:
```
localise.xml
install.php
```

to the root folder of the project making now possible:

* Install from folder using project root
* Install from folder user project/build/packaging after building package
* Install from generated package file after building package
* Discover install on test site after running `phing -f copier.xml`
* Download & install generated package from github

So basically all the installation types should work.